In SFTP, the slash is a path separator. That imo kind of means that a slash is not allowed in file/folder names.
Before posting, please read how to report bug or request support effectively.
Bug reports without an attached log file are usually useless.
/) successfully displayed a list of available drives (
B:, etc.). After updating to WinSCP v5.21 (and above), the displayed list is empty.
A:/). When I remove these trailing slashes, listing the root directory works as expected with WinSCP v5.19, v5.21 and above.